Some of those webcams and other USB devices are very picky about having the software installed before you plug them in and so on. I would unplug all of your USB devices, uninstall all the software that comes with them, go to Device Manager and uninstall all the related drivers, then restart. After you restart I'd install the software as directed in the manual (for example the cam you will probably have to install software, restart, and THEN plug it in). Be sure you restart after uninstalling everything to make sure its completely cleaned out before you try reinstalling.